India reportedly introduced "laser walls" to "plug the porous riverine and treacherous terrain" at its border with archenemy Pakistan, NBC News reported.
One of the world's most dangerous nuclear flashpoints, the India-Pakistan border is also among the most militarized. Both New Delhi and Islamabad deploy more than half of their 1 million and 600,000-strong armies, respectively, on the border.
According to the state-run Press Trust of India, around 45 laser walls will be installed in Punjab state.
Lasers beamed over rivers and hills will set off an alarm and alert the Indian Border Security Force if someone attempts to pass by, it added.